Synthesis
Dapsone was first synthesized by Fromm and Wittmann in 1908. 4,4'-Dinitrodiphenyl sulfide was oxidized to the sulfone in a solution of potassium dichromate, glacial acetic acid, and sulfuric acid. The nitro- groups on the sulfone were reduced with tin and concentrated hydrochloric acid, and the free base obtained by treatment with an alkali:
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